Feature Requests item #1540845, was opened at 2006-08-15 11:47
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Category: None
Group: None
Status: Open
Priority: 5
Submitted By: Justin Mason (jmason)
Assigned to: Nobody/Anonymous (nobody)
Summary: RFE: way for scanner to report subsumed tokens
Initial Comment:
hi --
Looking at re2c for SpamAssassin -- it's improved a lot
since the last time I checked ;) nice work!
one thing, though. it would be really great if re2c
could track subsumed tokens. For example:
/*!re2c
"foo" {return "FOO";}
"food" {return "FOOD";}
[\000-\377] { return NULL; }
*/
Assume the input string is "food", and an
appropriately-smart caller who knows to track the
YYCURSOR state and call multiple times until it
receives NULL is being used. This should return "FOO"
on first call, then "FOOD" on the second call, then
NULL on the third call.
Instead, the longest matching token is used: return
"FOOD" on first call, then NULL on the third call.
most re2c users could write their token tables to
automatically return *both* "FOO" and "FOOD" on the
first call -- and initially I was doing this. however,
in my usage, the tokens are derived from spamassassin
rules, so I can't always know if one is subsumed by
another... and determining this programatically in
advance would require rewriting most of re2c ;)
Instead, I've been changing my calling code to not
support full regexp semantics in the input to re2c.
This is obviously defeating much of the point, so I'd
love to fix that...
Are there any plans to implement this?
cheers,
--j.
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